When you are on the bus to work in the morning, smile to the people sitting beside you, you will get his smile .
A. in place
B. in need
C. in return
D. in relief
网友回答
A. in place
B. in need
(答案→)C. in return
D. in relief
解析：in place适当的； in need需要； in return 作为回报；in relief减轻，句意是早上坐车上班时，如果你对你对邻座微笑，作为回报你将得到他的一个微笑。故选A。